Indicator.



P. 6. WHEELER.

INDICATOR.

APPLICATION FILED NOV. 13, 1915.

Patented May 23,1916.

Attorn eys Specification of Letters Patent.

PERG'EY G. WHEELER, F ORANGE, MASSACHUSETTS.

INDICATOR.

Patented May 23, 1916.

Application filed November 13, 1915. Serial No. 61,365.

To all whom it may concern:

Be it known that I, PERCEY G. WHEELER, a citizen of the United States, residing at Orange, in the county of Franklin and State of Massachusetts, have invented a new and useful Indicator, of which the following is a specification.

The device forming the subject matter of this application is an indicator adapted to be employed in connection with drill presses, shapers, planers, grinders, lathes and machines of that character, for the purpose of ascertaining whether or not certain parts of the work are true.

The invention aims to provide a structure of this type embodying novel means for. securing a coaction between a pair of plungers, one of which is a work traversing plunger, the other of which constitutes a means for actuating the. finger which is adapted to move over the dial.

A further object of the invention is to provide novel means for adjusting the spring whereby movements of the finger are controlled. 7 It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without de- H parting from the spirit of the invention.

In the accompanying drawing :Figures 1 and 2 are longitudinal sections of the in dicator forming the subject matter of this application, the planes in the respective figures being disposed at right angles to each other; Fig. 3 is a cross section on the line 33 of Fig. 1; Fig. 4 is a cross sectionon the line 44 of Fig. 1; Fig. 5 is a fragmental perspective showing the head at the inner end of the indicating finger; Fig. 6 is a perspective showing an attachment adapted to be employed at times in connection with the indicator. Fig. 7 is a sectional view illustrating an attachment which may be used for clamping the indicator forming the subject matter of this application to the binding post of a surface gage, to a tool With the above and other objects in view post or the like. Fig. 8 is a bottom plan of the threaded core, the plunger of said core being removed.

The indicator forming the subject matter of this application preferably is fashioned from metal throughout and comprises a tubular body 1, in one end of which is formed a slot 2 receiving an arm 3 held in place by a securing element 4 mounted in the body, the arm to all intents and purposes constituting a part of the body. The arm 3 terminates at one end in a transverse head 5 inscribed with scales 6 reading in opposite directions from a common zero mark 7 and constituting a dial. An extension 8 is threaded at one end in the body 1 and is provided with a shoulder 9 which coacts with one end of the body. The extension 8 is of tubular form and slidable in the ex tension is a primary plunger 10 having a shoulder 11 coacting with a shoulder 12 formed in the bore of the extension, the shoulders cooperating to prevent the primary plunger from dropping out of the extension. Threaded into the interior of the body 1 is a core 14 in which is slidably mounted an eccentrically disposed secondary plunger 15 having a point 16.

The numeral 17 indicates a finger adapted to cooperate with the scales 6, the finger at its inner end being provided with a head 18 located in a chamber 19 formed in the body 1, the finger 17 passing outwardly through an opening 20 in the body, as will be under stood clearly from Fig. 1. The inner end of the head 18 is flat, as shown at 21, and is adapted to be engaged at one end by the point 16 of the secondary plunger 15. the opposite end of the plunger 15 being adapt ed to be engaged by the inner end of the primary plunger 10. Projecting laterally from the head 18 is a pointed trunnion 22 mounted to rock in a seat 23 formed in the interior of the body 1. Projecting from the head 18 in a direction opposite to the trunnion 22 is a trunnion 24 having a tapered socket 25 in its end adapted to be engaged by the pointed end of a screw 26 threaded into a screw 27 which in its turn is threaded into the body 1, the construction, obviously, being such that the finger 17 is mounted for swinging movement, so that one end of the finger may cooperate with the scales 6. Surrounding the trunnion 24 and a portion of the screw 26 is a helical spring 28, one end 34 of which is engaged with the finger 17 close to the head 18, the other end 80 of the spring being engaged in a superficial recess 31 in the core 1% at one end thereof.

In practical operation when the primary plunger 10 is pushed inwardly, the primary plunger will coact with the secondary plum ger 15, the pointed end 16 ot the plunger bearing against the end surface 21 of the head 18 to one side of the pivotal support" represented by the trunnions 22 and 2%. Thus, aswinging movement will be imparted to the finger. 17 the same enacting with the scales 6. p V

The tunctioirol tl'respri-ngQ JF is to return the extremity of the finger 17 to the Zero mark 7 of the dial (-6. In order to eliect an adjustment of thespring, the threaded core 14 is given a slight rotation,-it being observed that one end of the core is provided .ble when the extension 8 is removed.

with a screw-driver kcrf 36 which is acccssi- Thus, by rotating the core 14, the tension, of the spring 28 and Consequently the position of the end'o't the finger 17 with respect to the dial- 66 maybe adjusted. f

It is to be observed that by rotating the core let through an arc of 180 degrees, the

pointed end 16 of the secondary plunger 15 may be moved tromone end' of the flattened surface 21 of the head 18, to ,the other end thereof, thereby rendering the end lot the finger 17 e'liici ent in connecti on with one or the other of the-scales 6'. l i j v In Fig, 6 of the drawings there is shown an attachment which may be used when the device isemployed in connection with a planer, the attachment comprising a socket 32 to which is pivoted as shown at 33 an arm 40, one end 35 of which is adapted to be engaged by the exposed extremity of the primary plunger 10 when the extension 8 is inserted into the socket 32.

The device forming the subject matter of this application is of that j general type show-n in my prior Patent No. 937,978, and the general application of a device oft-his sort-is well understood by those skilled inf the art. H

For convenience in claiming the invention, the arm 3, the body 1 and the extension 8 maybe described briefly as a SUpPOTt upon which the movable and adjustable portions of the structure are mounted. I I

As shownin Fig. 7,. a clamping device may be employed for connecting the indicator forming the subject matterot' this aptpllication to a post or a machine of any kind,

tie clamping. devic above alluded to comprising rectangularly disposed socket members 100 and 101 united by a screw 102. a

' Having thus described the invention, what is claimed is j 1. In a device of the. class described, a

support including a dial a finger pivoted to i the support and coacting withithe' dial; 'a core rotatable in the support; a primary I plunger slidable in the support; a secondary plunger slidable in the core and engaging the primary plunger and the finger; and-a spring operatively connected with the finger to regulate the position of the finger with respect to the dial, the spring being operatively connected with the core, and the core beingrotatable to adjust thetension of the spring. r V

2. In a device ofthe class described, a support including a dial; a finger pivoted in. the support and coacting with the dial; a primary plunger slidable in" the support; a secondary plunger coacting with the finger and with the primary plunger; a spring op eratively connected atone end with the finger to regulate the position of. the finger "with respect to th eidial;' a core movable in the support the core constituting a guiding means for the secondary plunger and the other end'ot the spring heingattached to the 'core whereby the core will, act as a means "for adjusting the tension of the spring. 3. In a devicefot the class described,fa support including dial "having a Zero mark; .a finger pivoted to the support and coacting withthe dial ,the finger including an'otlset head; a core threaded into the'support; a primary plunger slidable in'thesup- 95 port; a secondary plunger slildableyin the core, the secondary plunger being eccentrically mounted withrespect to the core, whereby the secondary plunger 'will coact with the offset head; and spring means for holding the finger yieldably on the zero mark of the dial. H

4. In a device of the class described, a support including a dial having a Zero mark; a fingercoacting with the dial and including a head; pivot means uniting the headwith the support, the head having a bearingsurface extended-upon opposite sides "of the pivotmeansfa core in the support; a secondary plungerslidable vin the core, the core being rotatable to cause one end of tllf' secondary plunger to coact with either end of the bearing surface; a primary plunger slidable in'the support, the primary plunger being in engagementwith the other end of the secondary plunger; and springmeans for holding the finger yield ably on ihezero mark ofthe dial, Y i .f In testimony that I claim the foregoing as any own, I have heretoaifiXe-d my signature in thepresence of two Witnesses.

' IVitnesses:'

EDWARD M; BUELL',

W. P, CONRAD.

Copies of this patent may be obtained for five cents each, by addressing the Gommi ssioner'o! Patents, Washington, D. C. A V 

